水保所知识产出(1956---)知识库

选取荒石滩地 4 种重构土体作为研究对象，应用土壤碳通量测量系统(LI－8100)，对重构土体土壤呼吸
和水热影响因子进行原位监测，分析了重构土体土壤呼吸的日变化情况。结果表明，4 种重构土体土壤呼吸在观测
期间的日变化均呈现单峰曲线，最低值出现在 6 ∶ 00 或 20 ∶ 00，最高值出现在 10 ∶ 00、12 ∶ 00 或 14 ∶ 00。4 种重构
土体土壤呼吸值在 8 月份和 12 月份分别达到试验观测期间最大值和最小值，其中，添加蛭石、页岩、沙和砒砂岩重构
土体的最大值分别为 9．88、10．47、14．94 μmol·m
－2
·s
－1
和 12．19 μmol·m
－2
·s
－1
，最小值分别为 0．11、0．08、0．10 μmol
·m
－2
·s
－1
和 0．00 μmol·m
－2
·s
－1
，4 种重构土体日变化幅度的排序为添加沙＞页岩＞砒砂岩＞蛭石。4 种重构土体土
壤温度(指数模型)、土壤体积含水量(二次曲线模型)单因素以及土壤温度和含水量双因素(幂 － 指数模型)均能够解
释土壤呼吸的日变化，但是解释能力不同，双因素模型解释能力一般高于 50．0%，单因素模型中温度的解释能力显著高
于水分;3 种模型拟合下，添加蛭石重构土体水热影响因子对土壤呼吸日变化的解释能力最低，为 77%～97%，指数模型
和幂 － 指数模型下添加蛭石的重构土体土壤水热影响因子对土壤呼吸日变化的解释能力最低，分别为 41% ～96%和
77%～97%，二次曲线模型模拟下添加页岩重构土体土壤体积含水量对土壤呼吸日变化的解释能力最高，为28%～53%。

Four kinds of reconstructed soil mass in the barren beach were selected as the research objects． The
soil carbon flux measurement system (LI－8100) was used to monitor the soil respiration and hydrothermal factors of
the reconstructed soil mass in situ，and the seasonal respiration changes of the reconstructed soil mass and its com-
ponents were analyzed． The results showed that the daily changes of soil respiration for the four reconstructed soil
masses showed a single-peak curve，and the patterns of daily changes for soil respiration were basically the same．
The lowest value during the observation period appeared at 6 ∶ 00 or 20 ∶ 00，and the highest value appeared at 10
∶ 00，12 ∶ 00，or 14 ∶ 00． The soil respiration values of the four reconstituted soil masses reached the maximum
and minimum values during the experimental observation period in August and December，respectively，and the
daily variation range of the four reconstituted soil masses during the observation period． Among them，the maximum
values of reconstructed soil masses with meteorite，shale，sand，and soft rock were 9．88，10．47，14．94，and 12．19
μmol·m
－2
·s
－1
，respectively，the minimum values were 0．11，0．08，0．10，and 0．00 μmol·m
－2
·s
－1
．The order
was as sand＞shale＞soft rock＞meteorite． The four factors of soil temperature (index model)，soil volume water con-tent (quadratic model)，soil temperature，and water content (power-index model) can explain the daily variation
of soil respiration． However，the explanatory power was different，the explanatory power of the two-factor model was
generally higher than 50．0%，and the interpretation ability of temperature in the single factor model was significant-
ly higher than that of water．Under the fitting of three kinds of models，the hydrothermal influence factor of the addi-
tion of meteorite to reconstruct the soil mass had the lowest ability to interpret the diurnal variation of soil respiration
(77%～97%)． Under the exponential model and the power-exponential model，the soil hydrothermal influence fac-
tor of the addition of meteorite to reconstruct the soil mass had the lowest ability to interpret the diurnal variation of
soil respiration (41%～96% and 77%～97%)． Under the quadratic curve model，the soil water content of adding
the shale reconstituted soil mass had the highest ability to interpret the diurnal variation of soil respiration (28%
～53%)．